Multiply pasted end bag



E. B. HOPPE 3 MULT IPLY PASTED END BAG- v Original Filed Dec. 9, 1944 Feb. 8, 1949.

INVENTOR- 13? 191 EDGAR BiHol-c. azz 2% MW ATTORNEYTS- Patented Feb. 8, 1949 2,460,886 MULTIPLY PASTED END BAG Edgar B. Hoppe, New York, N. Y., assignor to St.

Regis Paper Company, New York, N. Y., a corporation of New York Original application December 9, 1944, Serial No. 567,427. Divided and this application December 3, 1946, Serial No. 713,801

z'ciaims. (Cl. 229-59) This invention relates to multi-ply pasted end bags and more particularly to bags of this type so constructed that the pasted end will have exceptional strength and yet be relatively flexible and have a completely sealed inner ply, the outer ply or plies also being sealed if desired.

This application is directed to certain divisional subject matter of my co-pending application Serial No. 567,427, filed December 9, 1944.

The purpose of the invention is to provide a bag of this type with an innerply which may prevent the contents of the bag from contacting any portion of any ply except the inner ply and which may exclude access from theexterior of the bag through the inner ply. For some purposes it is desirable to have the inner ply waterproof, for other purposes acid-proof, or to otherwise resist injurious action by the contents of the bag or damage to th contents of the bag from any conditions exterior to the bag. It is frequently desirable to have the contents thus securely sealed within 8. ply which may be suitably treated to contain and protect the contents for which the bag is intended, while outer plies may provide strength without necessarily having such special treatment.

Where a muiti-ply bag is closed by adhesive the usual type of closure is such that outer plies are exposed to the contents of the bag at some point in the closure. It is an object of the present invention to form such a closure in a way that will completely seal the inner ply and prevent any access of the contents of the bag to any ply except the inner ply.

For practical purposes, it is frequently advantageous to apply a compound to the inner ply before it is formed into a bag tube, which compound will quickly .dry so that it will not interfere with the usual tube forming operations and may be rendered adhesive by the applicationof heat when it is desired to seal the bag. Some of the materials suitable for this purpose may be welded .together under heat but do not readily adhere after having been dried, to some kinds of paper which might be desirable for the inner ply. Under such circumstances, the adhesive should be applied to both faces where they are to be united. Where the type of adhesive employed is such that it will readily adhere to both which not only completely seals the inner ply to prevent access of the contents of the bag to plies other than the inner ply, but is also especially effective in resisting injury and ing of the contents.

Moreover, the present invention is adapted for providing a pasted end closure of high strength wherein each ply is secured independently of and without necessarily relying upon the strength of other plies. The margins of the piles of the bag tube are so formed that each individual ply is presented at the pasted closure in a manner to accomplish this result.

Various further and more specific features and advantages of the invention will clearly appear from the detailed description given below taken in connection with the accompanying drawings which form a part of this specification and illustrate, by way of example, a preferred example of the invention. Theinvention consists in such novel-combinations of features as may be shown and described in connection with the example herein disclosed.

In the drawings:

Figure l is an illustration of a bag tube which has been prepared to form the closure embodying the present invention;

Fig. 2 shows a bag end formed from the tube shown in Fig. 1, the'end being opened up and with one end flap turned outwardly;

' Fig. 3 illustrates the bag end as shown in Fig. 2 with the end flaps turned in;

Fig. 4 is a finished bag end embodying the present invention; and

Fig. 5 is a sectional view taken on line 5-5 of I Fig. 4.

The form of the invention illustrated in the drawin s comprises a bag with only two plies, that is, an inner and an outer ply. However, it is to be understood that additional intermediate plies may be used or either of the two plies shown may constitute a plurality of layers or plies.

In Fig. l the end of the flattened multi-ply bag tube I0 is shown prior to the formation of the end closure therefor. The end is so shaped as to provide for a pair of specially formed inturned corner flap portions whichare toadjoin along diagonal fold lines a pair of side flap portions which are to be folded in along base fold lines to overlap, and to overlie, the corner flaps with a novel relationship of the margins of the various flaps. As partially indicated in Fig. 1 and as will be more apparent in Figs. 2 and 3, the end portions of the inner ply H and of the outer ply l2 terminate along different lines at the different flap areas.

In order to define the end portions of the side flaps and corner flaps, two parallel slits l3 are cut through the two opposed walls of the outer ply, and separate parallel slits H are similarly preventing siftupon which the diagonal folds will occur.

one another.

cut in the inner ply, the latter slits being nearer together then the former. It is desirable for said slits to terminate, as shown in F18. 1, at iine shll e ends or bottoms of slits i3 consequently are positioned further inwardly oi the bag tube end than the ends of slits H.

As shown in Figs. 2 and '3, end or corner flaps l8, l1 andside flaps I 8, ID are formed by folding the end portions inwardly along the diagonal fold lines It. The slits l8 and I thus define rectangular side and corner flap portions.

As indicated above, the inner ply (Fig. 1) is longer than the outer ply upon one side flap and both corner flaps. Consequently, an inner ply Ifia of the corner flap It extends inwardly beyond an outer ply lOb thereof. The same is true with reference to plies Ho and Ill) of the opposite corner flap.

The reason for providing inwardly extending portions of said corner flap inner plies is to facilitate the positioning of lines of adhesive in a manner to appear hereinafter whereby the inner ply is completely sealed with respect to the other ply or piles of the bag.

In order further to facilitate said sealing of the inner ply, the side flaps I8 and it are formed to have an overlapping stepped end relationship whereby corresponding plies may be adhered to As shown in Figs. 3 and 5, the stepped relationship of the side flap ends provides an inner flap [8a which extends beyond an outer flap lBb thereof. Conversely, with respect to side flap 19, an inner flap "a thereof is shorter than the outer flap lab,

The overlapping stepped end side flaps l8, I! are foldable respectively along base fold lines 2B and 2| whereby an end margin Ila of the inner ply of side flap i8 is presented to an end margin l8a' of the inner ply of the overlying side flap l9.

An analogous engagement of end margin 18b occurs with reference to the outer ply of the side flap I8.

It will be seen that side margin portions of the inner ply of flaps 18a and Ila extend outwardly with respect to the bottoms of slits i3. Thus,

' when the side flaps are folded upon their respective base fold lines 20, 2|, said extending side portions of the corner flaps lia, Ila will also be folded over and act as a seal to prevent any possible sifting through any small corner openings 20 (Fig. 4) which may occur at the bottoms of the slits i3. Any such sifting and access to the interior of the bag further will be prevented by a double seal formed respectively by the inner and outer plies as will be hereinafter set forth.

With reference to said slits l3 and II, it will be seen (Fig. 3) that the inner end portions of the corner flaps are divided from the side flaps thereby, and that the slits are positioned respectively along and outside of said base fold lines whereby. as above mentioned. the sides of the corner flap inner plies Ha, Ha extend out beyond the base fold lines and are folded in along such lines when the side flaps are folded in.

In order to provide a completely sealed inner ply, novel arrangements of the lines of adhesive are provided thereupon as shown in Fig. 2. At both side margins I811 of the corner flap inner ply iBa, lines of adhesive are provided to extend continuously along the length of silt l4. These lines of adhesive may adhere to the inherentfaces of side flap inner plies Ida and lie. Similar lines of adhesive are applied to corner flap ll. Thus the side margins of said inner ply corner flaps are completely sealed.

In order to complete the sealing of said-inner ply corner flaps, lines of adhesive are applied to the margins of the upper surfaces (Fig. 3) of the extending portions of the inner ply corner flaps. As shown on corner flap IS, the line of adhesive is provided, for example, along an end margin 18a" upon the upper surface thereof, to extend continuously from side to side of the flap. An analogous line of adhesive Ila" is applied to corner flap inner ply Ila.

Thus when the side flaps are folded inwardly from their respective base fold lines, said latter lines of adhesive will adhere continuously along their lengths to inner ply flap portions. If desired, to facilitate and insure a tight seal, lines of adhesive upon the side flap inner plies Illa and lfia may be applied as at 22 and 23, in alignment respectively with lines of adhesive Ito and Ho".

Completion of the sealing of the inner ply is accomplished by the adherence of the end margins IM and ifla' of the side flap inner plies. Thus, adhesive is applied upon the upper surface of the underlying side flap inner ply at the end margin i811 and a line of adhesive is applied to the cooperating inner ply end margin Illa of the overlying side flap at the under-surface thereof.

By virtue of said above described lines of adhesive, the inner ply of the bag is completely sealed from the other ply or plies and sifting therethrough consequently is prevented.

An additional seal may be provided at the end closure, comprising lines of adhesive which completely seal the corner and side flaps of the outer ply whereby access to the inner closure from the outside of the bag is effectively denied, thus providing a double barrier against sifting of the contents out of the bag or entrance therein of undesired matter. In the form shown, as in Fig- 3, said outer barrier of adhesive may be constituted by lines of adhesive upon side margins 18c at the under-surface of the underlying outer ply of the side flap i8. These lines of adhesive adhere to the end flap outer plies Nb and no. It is desirable to have a line of adhesive upon the end margin l8b', that is, upon the upper surface of the outer ply 18b, to cooperate with a line of adhesive placed upon end margin lob which is adapted for overlapping same in a manner above explained. The seal for the outer ply is completed by a line of adhesive at the side margins lOc upon the under-surface thereof which adheres to portions of the respective outerplies of the corner flaps and to portions of the side margins I80.

The lines of adhesive at We and 190 thus are placed along the slits l3 and upon the upper surfaces of the outer ply as viewed in Fig. 3. These surfaces become under" surfaces when the closure is formed as in Fig. 4. When the side flaps are folded over upon their respective base fold lines, of course, the adhesive at 180 will be upon the under-surface of the outer ply lilb and the adhesive upon the margins I will be overlying its respective flap portions.

Thus both theinner and the outer plies each form a completely sealed container.

It may also be desirable to provide the end and the side margins of the outer plies Hib and "b with adhesive whereby the under-surfaces of said outer piles of the side flaps will adhere to the upper surfaces of the respective inner plies Mia and Na.

It will be noted that, with the above-described construction, when the flaps are folded in there will be inner ply flap margins which are free to contact with, and which are adhered to, inner ply surfaces on other flaps along linesto completely seal the inner ply in such a way that the contents of the bag can have no access to anyv portion of the outer ply material. Also, the outer ply flap margins are such as to be free for contact with, and to be adhered to, outer ply surfaces of other flaps along lines to seal the outer ply against access to the inner ply. That is, the outer ply flap portions completely cover the inner ply flap edges. Thus a material for the inner ply may be chosen which will be especially capable of resisting injury from contact with chemicals or other materials which may be-contained in the bag, and yet such material may be of a nature which would be unsuitable for exposure at any point on the outside of the bag. On the other hand, a material for the outer ply may be chosen which will be especially suited for resisting abrasion or injury by moisture, and yet this material does not need to be capable of resisting injury by the contents of the bag. The adhesives which are chosen for the inner and outer seals respectively may similarly have different qualities particularly adapting same for resisting the contents of the bag and the conditions external to the bag respectively.

It will be further noted that none of the lines along which the inner seals are provided are superposed over the lines along which the outer seal is provided, and accordingly the existence of the double seal does not unduly interfere with a desirable flexibility of the end portion at any area, as would tend to be the case if there were superposed bands of adhesive. The maintenance of the relatively flexible nature of the enclosure is also aided by the fact that at the end and side margins of all of the flaps the ply ends are in stepped relation, thus substantially reducing the number of superposed plies over considerable portions of the flap areas. This stepped relation of the flap margins also makes it possible to seal the inner ply and the outer ply flap portions independently to the extent that the sealing of the one does not necessarily rely on the strength of the sealing of the other.

While the invention has been described with respect to a certain preferred example which has given satisfactory results, it will be understood by those skilled in the art after understanding the invention that various changes and modifications may be made without departing from the spirit and scope of the invention, and it is intended, therefore, in the appended claims, to cover all such changes and modifications.

What is claimed as new and is desired to be secured by Letters Patent is:

1. A plural ply pasted-end bag, the end closure of which comprises a pair of inturned corner flap portions adjoinin along diagonal fold lines a pair of side flap portions which are folded in along base fold lines to overlap, and to overlie the corner flaps, the inner ply of the underlying side flap protruding beyond the outer ply or plies thereof, the outer ply of the overlying side flap protruding beyond the inner ply or plies thereof, the inner ply of the corner flaps protruding inwardly beyond the outer ply or plies thereof, the end portions of the side flaps being divided 6 from the end portions of the corner flaps by slits in each ply, the inner ply slits being spaced inwardly with respect to the outer ply slits and said diagonal fold lines of the inner ply extending inwardly beyond the ends of the slits of the outer ply, the sides of the inner ply of the corner flaps, when the side flaps are open, extending out beyond the outer ply of the corner flaps and beyond said base fold lines and being folded in along said lines when the side flaps are folded in, the inner ply flap margins, when the flaps are folded in, thus being free to contact with and being adhered to inner ply surfaces on other flaps along lines to completely seal the inner ply against access of the bag contents to the outer ply or plies of the end closure, and the'outer ply flap margins being free to contact with and being adhered to outer ply surfaces on other flaps along other lines to seal the outer ply againstaccess to the inner ply.

2. A plural ply pasted end bag, the end closure .of which comprises a pair of inturned corner flap portions adjoining along diagonal fold lines a pair of side flap portions which are folded in along base fold lines to overlap, and to overlie the corner flaps, the inner ply of the underlying side flap protruding beyond the outer ply or plies thereof, the outer ply of the overlying side flap protruding beyond the inner ply or plies thereof, the inner ply of the corner flaps protruding inwardly beyond the outer ply or plies thereof, the end portions. of the side flaps being divided from the end portions of the corner flaps by slits in each ply, the inner ply slits being spaced inwardly with respect to the outer ply slits, the outer ply at the sides of the side flaps extending beyond the inner ply or plies and the sides of the inner ply of the corner flaps extending beyond the outer ply of the corner flaps, the construction thereby providing end and side edges on the inner ply of each flap which are spaced from the end and side edges on the outer ply of each flap, and the inner ply flap margins, when the flaps are folded in, bein free to con tact with and being adhered to inner ply surfaces on other flaps along lines to completely seal the inner ply of the end closure, and the outer ply of the flaps completely covers the inner ply flap edges.

EDGAR B. HOPPE.-

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,821,207 Cornell Sept. 1, 1931 1,960,929 Taggart May 29, 1934 1,971,625 Shively Aug. 28, 1934 2,073,222 Robinson Mar. 9, 1937 2,100,828 Winskill Nov. 30, 1937 2,157,392 Williams May 9, 1939 2,176,499 Hoppe et al Oct. 17, 1939 2,232,497 Tooker Feb. 18, 1941 2,266,905 Potdevin Dec. 23, 1941 2,305,192 Poppe Dec. 15, 1942 2,311,248 Poppe Feb. 16, 1943 2,311,733 Bushman Feb, 23, 1943 FOREIGN PATENTS Number Country Date France Feb. 21, 1925 

